sysconf zz

 

    #include <stdio.h>
    #include <unistd.h>
    #define ONE_MB (1024 * 1024)
    int main (void)
    {
        long num_procs;
        long page_size;
        long num_pages;
        long free_pages;
        long long  mem;
        long long  free_mem;
        num_procs = sysconf (_SC_NPROCESSORS_CONF);
        printf ("CPU 个数为: %ld 个\n", num_procs);
        page_size = sysconf (_SC_PAGESIZE);
        printf ("系统页面的大小为: %ld K\n", page_size / 1024 );
        num_pages = sysconf (_SC_PHYS_PAGES);
        printf ("系统中物理页数个数: %ld 个\n", num_pages);
        free_pages = sysconf (_SC_AVPHYS_PAGES);
        printf ("系统中可用的页面个数为: %ld 个\n", free_pages);
        mem = (long long) ((long long)num_pages * (long long)page_size);
        mem /= ONE_MB;
        free_mem = (long long)free_pages * (long long)page_size;
        free_mem /= ONE_MB;
        printf ("总共有 %lld MB 的物理内存, 空闲的物理内存有: %lld MB\n", mem, free_mem);
        return (0);
    }